Sand-molding machine.



PATENTED OCT. 3, 1905.

E. & T. MISTELSKI.

SAND MOLDING MACHINE.

APPLICATION FILED AUG. 3. 1904.

ZS'HEETS-SHEET l.

PATENTED 00T. 3,1000.

E. & T. MISTELSKI.

SAND MOLDING MACHINE. APPLIGATION HLBD. AUG. 3, 1004.

2 SHEETS-SHEET 2.

UNITED savagesv PATENT OFFIOE.

SAND-MOLDING MACHINE.

Speccaton of Letters Patent.

Patented Oct. 3, 1905.

Application filed August 3, 1904. Serial No. 219,297.

To r/,Z/f '1u/1.0ml it muy concern:

Be it known that we, ELIZABETH MIs'rnLsKI and 'li-rnoDoR MIsTnLsKI,citizens of the United States, residing at Alliance, in the county ot'Stark and State ot' Ohio. have invented new and useful Improvements inSandh'lolding Machines, ot' which the 'following is a specilication.

Our invention relates to sand-molding machinos.

The object of the present invention is to provide improvements on thesand-molding machines sct forth in the patents to Theo. Mistelski, No.430,666, dated June 24, 1890, and No. 450,521, dated April 14, 1891,particularly in the provision of novel tamping mechanism whereby aplurality of tampers are employed, each being yieldably independent otlthe others and moving all of the tampers as a unit or bank to supplypressure to the sand or moving the carriage and mold toward the tamper-sfor the same purpose,

and providing' improved means for raising4 and lowering the pattern onthe carriage Without any binding effects, and, further, to makeprovision for novel means for jarring or vibrating the pattern in ageneral backwardand-forward direction to cause the sand to settle aboutthe pattern and insure the best possible tamping effect by the tampersand to jar or vibrate the pattern in a general up-anddown direction toclear it from the mold and permit its easy withdrawal without the use ostripping-plates or other clearing devices.

rl`he invention also contemplates the provision ot' other improvedfeatures, which, together with the detailed construction of the machine,will be fully described hereinafter and the novel features recited inthe appended claims. l In the accompanying drawings, Figure 1 is a sideelevation; Fig. 2, a vertical section on line fr: af ot' Fig. 1; Fig. 3,a longitudinal detail section of the carriage; Fig. 4, a crosssection online 4 4 of Fig. 3; and Figs. 5 and 6, views showing different ways inwhich steam, air, or hydraulic pressure may be applied.

The frame consists of a bed l and uprights or standards 2. The bed 1 hasrails 3, on which the wheels 4 of carriage 5 run, and stops 6 may beemployed to position the carriage at the proper point, it beingunderstood that, it' desired, another carriage may be employed withflask and banking-frame to be run Linder the frame 2 after the lirstcarriage is removed to form the second half ot' the mold. Only onecarriage can be used, it' desired. The carriage is provided with avertically-sliding rectangular frame 7, on which the pattern `8 issupported and adapted to be positioned by said frame inside ot' thetlaskQ, which has the banking-frame 10 superposed thereon. To raise andlower the frame 7, we provide eccentrics 11, secured on alongitudinally-extending shaft 12, equipped with an operating-crank 13,said eccentrics working instraps or blocks 14 on the frame 7, theeccentrics being located at the ends of said frame. By the use ot' twoeccentrics thus positioned there is no binding as the frame 7 is raisedand lowered and it is secured where positioned.

The top of frame 7 consists ot' a longitudinally-movable pattern-table15, to which the pattern 8 is secured by a bolt 16, extending looselythrough said table 15, and a spring 17, operating on said bolt, holdsthe pattern yieldingly down on the table. The table 15 is supported onrollers 18, carried by frame 7, and it has depending lugs 19. Carried byframe 7 -is a cylinder 20, in which is a movable piston 21, carrying atits opposite ends knockers or rappers 22, adapted to strike against thelugs 19 in alternation as the piston is rapidly vibrated by thepressuretsuch, as air, steam, or other liuid supplied to the cylinder 20by a flexible hose 23 --thus shaking the table 15 to and frohorizontally a limited distance and with it the pattern. Suitableautomatic valve mechanism 24 is employed, by preference, to admit andexhaust the air from the cylinder 20, and in addition acontrolling-valve 25 may be employed to completely cut otl' thepressure. The object of this mechanism is to vibrate the pattern in thesand as the tamp- -ing mechanism is acting to cause the sand to settlearound the pattern and be better compacted or compressed by the tampers,which otherwise might not be able to pack the sand with equal density.Another cylinder 26 is carried by frame 7, and within said cylinder is aVibratory piston 27, having a rapper 28, adapted to strike on the bolt16 and vibrate the pattern up and down, suitable automatic valvemechanism 28 being employed to admit and cut off pressure to the saidpiston, and a controlling-valve 29 is also used in the flexible hose 30,which supplies pressure to cylinder 26 for the purpose of stopping theaction of the piston 27. The purpose of this mechanism is to vibrate thepattern up and IOO down in the mold after the mold has been tamped andafter the pressure vibrating mechanism for shaking the table has beenstopped, and the ellect is to completely free or clear the pattern fromthe mold and leave the mold sharp, clean, and unbroken, so that thepattern can be removed from the mold by lowering the frame 7 after themold has been completed without danger of injuring the imprint andobviating the use of a stripping-plate.

On the standards 2 are stationary pistons 31, above and below which openout ports 32 and 33, or separate pipes could be used, if desired. Theports 32 are connected by a pipe 34 and the ports 33 by a pipe 35,pressure to pipes 34 and 35 being controlled by a fou r-way valve 36. Asuitable pressure-gage 37 may also be used. The tamping box or frame 38slides up and down on the standards 2 and is provided with the cylinders39, having suitable stufling-boxes at their ends, said cylinders slidingon the pistons 31. The tamping-frame 33 has cross-pieces 40 and 41,through which slide the independently-mounted tampers 42, having feet43, adapted to operate in the flask at various points to completelytampor pack all of the sand. Any number of rows of these tampers arranged inany manner can be employed. 0n the upper ends of the tamper-rods arenuts 44, by the adjustment of which the amount of play of the tampers isregulated. Each tamper-rod also carries a collar 45, between which andthe upper cross-piece 40 of the tamping-frame is a coil-spring 46, onespring being provided for each tamping-rod. It will therefore be seenthat the tampers are all carried by the tamping-frame and move as anentirety with said frame, but that each tamper is independentlyspring-pressed and its play can be regulated independently of the othertampers and that each tamper will accommodate itselfl to the sandirrespective of the action of the other tampers.

When a pattern has low and high parts, so that the sand above them isdeep in some places and shallow in others, it will not do to tamp allparts with the same pressure, because that would pack the sand harderwhere it is shallow. In order to e'eet a uniform pressure, the tampersabove the high parts of the pattern are adjusted to a higher level thanthe others by means of the nuts 44. The lower tampers then operate firston the deep sand, and after that has been well rammed the other tampersact on the shallower portions. This produces a more even and uniformpressure than if all the tampers had been brought down upon the sand atonce. lt also avoids the danger of injuring the high parts of thepattern.

Operating the valve 36 one way admits pressure to pipe 34 and causes thepressure admitted to the cylinders 39 to force the tamping-frame andtampers down to act upon the sand, and operating the valve 36 anotherway cuts oil'l and exhausts the pressure below the pistons 3l and admitspressure above said pistons 31, thereby raising the entiretan'ipingframe. rlhese operations can be carried on as many times as maybe desired to properly tamper compact the sand around the pattern, afterwhich the tamping-frame is raised and the carriage wheeled away, theframe 7 lowered to withdraw the pattern, and the flask removed forpurposes of casting; but prior to withdrawing the pattern the same willbe vibrated up and down to clear it of the mold by the use of thepressure vibrating mechanism herein set forth. During thetampingoperation before described the pattern and table l5 are vibratedhorizontally by the pressure vibrating mechanism to insure a settling ofthe sand and proper tamping thereof.

Fig. 5 illustrates the manner in which a single cylinder 47 can be usedto raise and lower the tamping-frame 38. The tam pingframe 38 has guides48, which slide on the uprights 2, and is connected to a piston-rod 49,having pistou 50, operating in cylinder 47. The pressure is admitted atopposite ends of the cylinder at different times by manipulating a valve51.

In Fig. 6 the tamping-frame 33 is secured to the uprights 2, and thecarriage is raised and lowered relatively to the tampers byemployingacylinder 52, piston 53 operating therein and sustaining thetrack-platform 54 ofthe carriage. which latter is guided on the uprights2. Pressure to the cylinder 52 is controlled by a valve 55.

The flask having been placed on the carriage and the latterl properlypositioned beneath the tampers, the crank 13 is operated to raise thepattern-table 15 to constitute the bottom of the flask, the patternhaving been secured on the table. The sand is then introduced into theflask and air or fluid pressure applied to relatively advance thetampers and the carriage, more sand being introduced and thetamping-frame and carriage being relatively retreated and advanced asthe operation proceeds. The different tampers yield independently andaccommodate themselves to the sand and to the pattern, and their playcan be limited as found desirable. Vlfrhile the tamping operation isproceeding the operator turns pressure into cylinder 2O to cause aforward-and-backward vibration of the table 15 in order that the sandmay properly settle as it is tamped, and thus conform to the pattern.After the mold has been formed pressure is let into the cylinder 26 tovibrate the pattern up and down to cause it to clear itself from themold, and the vcarriage and tamping-frame are relatively moved toseparate them, the vibrating mechanisms having been stopped. Thecarriage is then wheeled away and the pattern lowered out of the moldIOO IIO

by operating the crank 13. The llask can then be removed. VA separatecarriage can be used to forni the other halt of the mold while the lirstcarriage is being moved away or the same carriage can be used again` Itwill be understood that our invention contemplates the relative movementof the carriage and tamping devices, and either the carriage or thetamping device may be moved.

Various changes of construction may be resorted to in carrying out theinvention, and other embodiments thereof than those shown and describedmay be used.

Having' thus described our invention, what we claim as new, and desireto secure by Letters Patent, is

l. In a sand-molding machine, the combination with a ask, of atamping-frame having series of upper and lower guides, a series ofindependently-movablc tainpers having stems slidable in the upper andlower guides, collars on the tamper-stems, coil-springs on the saidstems interposed between the collars and the upper guides, adjustablenuts on the upper ends of the stems which limit the play of the tampers,and constitute means for independently tensioning` the springs, wherebythe play and tensioning of the tampers may be independently regulated,and means for moving the tamping-frame and flask relatively to eachother.

2. In a sand-molding' machine, the combination with a liask, of amovable pattern-support, means Jfor vibrating' said supporthorizontally, and separate means for vibrating it vertically.

3. In a sand-molding machine, the combination with a flask, of apattern-support, a pattern, an anvil extending loosely through thepattern-support, a spring cooperating with the pattern to hold it downon the patternsupport, and a hammer for striking said anvil to vibratethe pattern up and down in the flask.

4. In a sand-molding machine, the combination with a flask, of apattern-support, a pattern, an anvil extending loosely through thepattern-support, a spring cooperating with the pattern to hold it downon the patternsupport, an independent pressure-cylinder, apressure-operated piston in the cylinder, and a hammer operated by saidpiston adapted for striking' said anvil to vibrate the pattern up anddown in the flask.

5. In a sand-molding machine, the combination with a flask, of ahorizontally-vibratable pattern-support for the liask, an independentpressure-actuated hammer for striking' the pattern-support and vibratingit horizontally, a pattern movable up and down relatively to thepattern-support, and a pressureactuated hammer for vibrating the patternup and down in the flask independently of the horizontal vibration ofthe pattern-support.

6. In a sand-molding machine, the combination with a support for theflask, of a tamping- Jframe carrying a series of independent tampers,columns at the sides of the frame, cylin-A ders surrounding said columnsand attached to said frame, pistons on said columns inside saidcylinders, and means for controlling a supply of fluid-pressure to saidcylinders.

In testimony whereoil We have signed our names to this specification inthe presence of two subscribing witnesses.

ELIZABETH MI STELSKI. THEODOR MIS'IELSKI. WV i tn ess es:

D. M. ARMSTRONG, W H. DRnssLER.

